extends Spatial

export(NodePath) var LookAtTarget setget _set_lookAtTarget_path

### Railgun turret entity controller


onready var skeleton = $Armature/Skeleton
onready var turret_yaw_bone = skeleton.find_bone("turret head")
onready var turret_pitch_bone = skeleton.find_bone("vertical joint")
onready var vert_eyes = $VertEyes
onready var turret_eyes = $Armature/Skeleton/turretAttachement/TurretEyes

var first_call: bool = true
var target: Position3D

#var additional_rotation = Vector3(90, 0, 0)

func _set_lookAtTarget_path(new_value):
	# Because get_node doesn't work in the first call, we just want to assign instead.
	# This is to get around a issue with NodePaths exposed to the editor.
	if first_call:
		LookAtTarget = new_value
		return

	# Assign skeleton_path to whatever value is passed.
	LookAtTarget = new_value

	if LookAtTarget == null:
		return

	# Get the node at that location, if there is one.
	var temp = get_node(LookAtTarget)
	if temp != null:
		if temp is Position3D:
			target = get_node(LookAtTarget)
			return
		else:
			print("Railgun.gd: Got invalid LookAtTarget: ", LookAtTarget)
			return
	else:
		print("Railgun.gd: Got no LookAtTarget: ", LookAtTarget)

func _ready():
	pass  # configuring skeletonIK


func _process(delta):
	# Calculating the two points where the vertical joint should point to to aim at the target
	"""
	var T = target.transform.origin
	var C = skeleton.get_bone_global_pose(turret_pitch_bone).origin  # Vector3 root of the pitch bone
	
	var radius_C = (skeleton.get_bone_global_pose(turret_yaw_bone).origin - C).length()
	var normal_C = (T-C).normalized()
	
	var normal_C_angle = acos(Vector3(0, normal_C.y, normal_C.z).dot(normal_C))  # to transform the T point into a 2D plane and THEN do 2D circle intersection
	
	var radius_T = (T - C).length()  # length of CT which will be the radius of the circle around T"""
	if first_call:
		first_call = false
		if target == null:
			_set_lookAtTarget_path(LookAtTarget)
	
	var turret_height_diff = (turret_eyes.global_transform.origin - vert_eyes.global_transform.origin)
	
	vert_eyes.look_at((target.global_transform.origin-turret_height_diff), Vector3.UP)
	skeleton.set_bone_pose(turret_pitch_bone, Basis(Vector3.RIGHT, -1*vert_eyes.rotation.x))
	
	var vert_bone_direction = skeleton.get_bone_pose(turret_pitch_bone) * Vector3.UP
	
	var target_pos = skeleton.global_transform.xform_inv(target.global_transform.origin)
	
	var rest = skeleton.get_bone_global_pose(turret_yaw_bone)
	rest = rest.looking_at(target_pos, vert_bone_direction)
	
	# Get the rotation euler of the bone and of this node.
	#var rest_euler = rest.basis.get_euler()
	
	# Apply additional rotation stored in additional_rotation to the bone.
	
	# Make a new basis with the, potentially, changed euler angles.
	#rest.basis = Basis(rest_euler)
	
	skeleton.set_bone_global_pose_override(turret_yaw_bone, rest, 1, true)